[LLVMdev] Patch to allow llvm.gcroot to work with non-pointer allocas.

[nicolas geoffray]

Thanks for the heads up Chris.

Talin, how is your GC dealing with non-pointers (be it allocas or not)? What
is the use-case (either in C or LLVM)?

Nicolas

On Fri, Sep 24, 2010 at 7:00 PM, Chris Lattner <clattner at apple.com> wrote:

> On Sep 22, 2010, at 8:52 AM, Talin wrote:
> > I'm moving this thread to llvm-dev in the hopes of reaching a wider
> audience.
> >
> > This patch relaxes the restriction on llvm.gcroot so that it can work
> with non-pointer allocas. The only changes are to Verifier.cpp - it appears
> from my testing that llvm.gcroot always worked fine with non-pointer
> allocas, except that the verifier wouldn't allow it. I've used this patch to
> build an efficient stack crawler (an alternative to shadow-stack that uses
> only static constant data structures.)
> >
> > Here's a deal: If you accept this patch, I'll write up an extensive
> tutorial on how to write a stack crawler like mine. (Actually, it's already
> written, however without this patch the tutorial doesn't make any sense.)
>
> Hi Talin,
>
> I don't think anyone is really using the GC support, other than Nicolas in
> VMKit.  If he's ok with the change, I am too.  Please make sure the dox stay
> up to date though.
>
> -Chris
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